Market reforms, including expansions of contracting rights for employers and employees, have as a rule been followed by increases in per capita GDP and wages. The positive impact of a reduction in restrictions on the labor market, in favor of contract rights, has been widely observed and studied by economists.

Course in the US wages have been stagnant for 40 years now.

Wage growth has slowed, but hasn't ceased altogether. Statistics showing wages not growing or diverging from productivity are due to a misapplication of the inflation index:

https://www.brookings.edu/opinions/sources-of-real-wage-stag...

Anyway, the US has embarked on a massive social democracy course since 1965, so a slowdown in the rate of development is what you would expect.

This is a well-established fact in Economics.

https://fivethirtyeight.com/features/what-is-driving-growth-...

Annual spending growth (inflation adjusted) on various components of social welfare spending (1972 - 2011):

>Pensions and retirement: 4.4%

>Healthcare: 5.7%

>Welfare: 4.1%

Annual economic growth over the time frame:

>2.7%

This is annual growth, over a course of 40 years, resulting a massive increase in social welfare spending as a percentage of GDP.